graphql_query · MCP GraphQL Sales Server MCP: Risk & Policy

WHAT IT DOES

What graphql_query does on MCP GraphQL Sales Server

AI agents invoke graphql_query to trigger actions in MCP GraphQL Sales Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why graphql_query needs a policy

Executing raw/arbitrary GraphQL queries is an Execute-category action because the actual effects depend entirely on the query arguments. While the server is described as read-oriented (sales data), a raw GraphQL interface may expose mutations that can write or destructively modify data.

From the tool's definition "Run a raw GraphQL query against the sales API" — the tool executes arbitrary, user-supplied GraphQL queries.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

graphql_query Rate-limited

graphql_query stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "graphql_query": {
      "limits": [
        {
          "counter": "graphql_query_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches MCP GraphQL Sales Server, so you can run agents against it safely.

FAQ

Questions about graphql_query

What does the graphql_query tool do? +

Run a raw GraphQL query against the sales API. It is categorised as a Execute tool in the MCP GraphQL Sales Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on graphql_query? +

Register the MCP GraphQL Sales Server MCP server in PolicyLayer and add a rule for graphql_query: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches MCP GraphQL Sales Server. Nothing to install.

What risk level is graphql_query? +

graphql_query is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit graphql_query? +

Yes. Add a rate_limit block to the graphql_query rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block graphql_query completely? +

Set action: deny in the PolicyLayer policy for graphql_query. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides graphql_query? +

graphql_query is provided by the MCP GraphQL Sales Server MCP server (jambelg/mcp-graphql-claude). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.